Furnace-door attachment.



L. D. WEST.

FURNACE DOOR ATTACHMENT.

' APPLICATION FILED JUNE 29.1917. 1,267,298.

Patented May 21, 1918.

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FURNACE DOOR ATTACHMENT.

APPLICATION FILED JUNE 29, 1917.

1,267,.Q98. Patented May 21, 1918.

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' heat value of requires the LEONIIDAS 1). WEST, OF DENVER, COLORADO.

FURNACE-DOOR ATTACHMENT.

Specification of Letters Patent.

Patented May 21, 1918.

Application filed June 29, 1917. Serial No. 177,822.

Toallwhom it may concern:

Be it known that I, Lnonroxs D. WVEST, a citizen of the United States,residing at Denver, in the county of Denver and State of Colorado, haveinvented certain new and useful Improvements in Furnace-DoorAttachments; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

The present invention relates to improvements in smoke consuming andfuel saving devices. It is well known that when a fresh supply of coalis spread over the fuel bed in a stove or furnace, it is heated to approximately two thousand degrees within two or three minutes. Thisrapidly distils the gases which constitute anywhere from fifteen percent. to forty per cent. of the coal and this distillation occurswhether air is admitted or not, but to consume these gases requires bothair and ignition heat as well as thorough intermixture with gases in thefire box. If either is lacking, there will be a great quantity of smokecreated.

Coal, wood, oil'or any combustible matter can be consumed in the openair with unlimited oxygen and yet produce an unmense volume of smoke. Itis evident, therefore, that the problem of abating smoke supply ofoxygen in proper prothe right periods, at proper ignition temperature,and at the correct point or points to produce instant and thoroughintermixture of the oxygen and gases, before the latter escape from thecombustion chamber. My invention has for its object to meet theserequirements,

1. By the opening of an air inlet valve when the fireman opens the coaldoor, so that he cannot forget to feed the extra quantity of'air whichis necessary immediately after coaling to assist in burning the gases.

2. By the provision of an air pro-heating device through which theincoming air passes before it is discharged into the fire box.

3. By the utilization of the usual space between the coaling door andthe perforated flame buffer for a secondary air heating chamber and,

4. By constructing the device to render it adaptable for use inconnection with other air heating devices.

portion, at

7 With the foregoing general objects in view, the invention resides inthe novel features of construction and unique combination of parts to behereinafter fully described and claimed, the descriptive matter beingsupplemented by the accompanying drawings which form a part of thisspecification and in which:

Figure 1 is a front elevation of a portion of a furnace showing theapplication of the invention to the coaling door thereof.

Fig. 2 is a vertical section showing an edge elevation of the partsdepicted in Fig. 1.

Fig. 3 is a vertical section on the plane of the line 3-3 of Fig. 1.

Fig. l is a view similar to Fig. 2 showing the supplemental air inlet inopen position.

Figs. 5 and 6 are vertical sections on the planes indicated by the lines5-5 and 6-6 respectively of Fig. 3.

' In the drawings above briefly described, the numeral 1 designates aportion of a furnace which is equipped with the usual door opening 2 andcoaling door 3. The door 3 is provided with a common type of perforatedflame buffer spaced therefrom by sleeves 5 through which screws or thelike 6 pass, this being common construction. One feature of the presentinvention, however, consists in closing the space between thebufier andthe door, along the vertical and the top edges of the former, this beingaccomplished by the provision of a frame 7 of arch shape extendingaround and supported by the sleeves 6 as illustrated clearly in Fig. 6.In some instances the frame 7 could well be constructed of one piece butin most cases it will be formed of a pair of inverted L-shaped bars 8whose horizontal arms overlap each other and are secured to gether by abolt or the like 9.

By the provision of the frame 7 the space between the buffer 4: and thedoor 3 constitutes an air heating chamber into which a quantity of airis admitted by the opening of a damper 10, when the handle 11 of thedoor is actuated to open said door. The air, after being heated in thechamber in question, and in another pre-heating chamber to be described,is discharged from the perforations of the buffer 4 in a plurality ofjets which insure thorough mixing thereof with the hot gases in the firebox. A thin sheet of the heated air is simultaneously discharged at thelower end of the buffer, between said end and the door 2. This heatedair mingling with that supplied by the other air heating means yet to bedescribed, produces perfect combustion even immediately after coalingand thus prevents excessive smoking, by prompt and thorough burning ofthe gases.

The damper plate 10 above referred to is pivoted at 12 t the upper endof an air heating casing 13 which is either formed integrally with orotherwise secured to the outside of the door 3, the outer end of saidcasing having an air inlet which is normally closed by said damperplate, said inlet, however, serving to admit air to perforations let inthe door 3, when said plate is opened.

The air passes not only directly through the upper portion of the casingand through the perforations 14, but heated air is displaced from thelower portion 15 of said casing, and this rising air causes a quantityof the incoming air to pass downwardly into the chamber 15 so that suchair is more or less pro-heated. The heating efficiency of the chamber 15is increased by the provision of a suitable web 16 positioned thereinand contacting with the door 3 so that heat is I absorbed from thelatter, the web in question being preferably though not necessarily ofthe Y-shape illustrated in Fig. 5, whereby the ascending air will beforced to impinge upon the horizontal arms of the web as well as uponthe sides of the casing.

These ribs support and brace the center of the casing 13 to prevent itsbreakage.

For the purpose of opening the damper plate 10 when the handle 11 isoperated to open the door 3, any suitable connections could well beemployed. F or illustration purposes, however, I have shown a link 17which may be pivoted at its upper end to.

either of a pair of cars 18 which project outwardly from the damper, thelink being pivoted to one car when the handle 11 is positioned at oneedge of the door, while it is necessary to connect said link with theother ear when the handle is located at the opposite edge of the door.The lower end of link 17 is pivoted to a latch 19 which is in turnpivoted at 20 to the door or to a plate 21 which may be secured to saiddoor, said latch cooperating with a hook-shaped cam 22 which may beformed integrally with or otherwise secured to the handle 11, the,latter being pivoted to the door or to plate 21 as indicated at 23. Inthe present SllOWll'lg, the latch 11 is mounted for vertical swingingbut it will be understood that it could well move horizontally and insome case's it might well have a sliding rather than a pivotal motion,such details lying clearly within the scope of the invention.

The device constructed as or substantially as so far described may beoperated independently of any other air heating means if required but inmost cases it will be employed in conjunction with a suitable airheating casing 24 mounted on the door 3 and spaced slightly in rearthereof, saidcasing having upper and lower air spraying devices 25 and26, whose construction constitutes no part of the present invention,

beingincorporated in my copending U. S.

application, Serial No. 174319, filed on or about June 12, 1917. Thecasing 24; is equipped with a pair of air supply pipes 27 which passthrough the buffer 4, through the door 3, and through the lower portionof the casing 13, the inner ends of said pipes having nuts or othersuitable stops 28, contacting with the buffer 1, whereas sleeves or thelike 29 are threaded on the outer ends of said pipes in contact with thecasing 13. This arrangement of pipes 27 causes them to not only supportthe casing 24: and serve as air supplying means therefor but effectivelyclamps the casing 13 in place without the necessity of employing otherfastening means. On account of these advantages therefore, the specificfeatures of construction in question are by preference employed althoughit is to be understood that other suitable means could well be providedfor carrying out the same ends.

The specific operation of the parts 2 1, 25

and 26 is set forth in the application above referred to and it needtherefore be only stated here, that these devices serve to sup plyheated air at different temperatures to the fire box to set up acirculation therein, which circulation insures thorough mixing of theair with the hot gases, so that combustion is greatly augmented. The hotair supplied from the spraying device 25 and 26 mixes with the heatedair which is discharged from the perforated buffer a when the damperplate 10 is opened, the compounding or mixing of all of this air withthe hot gases and smoke in the fire box, serving to cause practicallyperfect combustion so that the furnace will not smoke excessively evenafter a fresh quantity of coal has been supplied. v

Particular emphasis is laid upon the fact that the damper 10 is openedwhen the handie 11 is actuated to open the-door, it being thus insuredthat the fireman shall not neglect to supply the needed'quantity ofextra air after supplying the coal. It is also to be observed that thedamper 10 is held in open position by the cam 22 and the latch 19 asshown in Fig. at. By thisarrangement, the damper may be held open anysuitable length of time and then closed, byv tripping the latch but asaboveset forth, thereis no danger whatever of the fireman failing toopen the same since opening of the door opens said damper.

Another feature worthy. of note is the frame 7, since the use of-thisframe converts the space between the usual buffer and coaling door intoan air heating chamber. It is to be understood, however, that onfurnaces in which the buffer extends entirely to the edges of the door,the frame 7 need not be employed. This rarely occurs, however, incomparatively large furnaces.

Yet another feature upon which particular emphasis is laid, is thepre-heating chamber 15 in the lower portion of the casing 13, for thepurpose of heating the incoming air to a slight extent before it isadmitted into the heating chamber between the door and the buffer.

On account of the several advantages of the specific features ofconstruction above described and illustrated in the drawing, thesefeatures constitute the preferred form of the improved device. I wish itunderstood, however, that within the scope of the invention as claimed,numerous minor changes may Well be made.

No claim is herein made to the construction of the parts 2 1, 25 and 26as they form the subject matter of another application, Serial No.174,319, filed June 12, 1917. There is nevertheless an importantcoaction be tween these parts and the pivoted damper 10, since theheater 24 continuously supplies hot air to the fire box to insure properoombustion while the door remains closed, and the damper 1O augments theaction of said heater immediately after coaling.

I claim:

1. The combination with a furnace coaling door havin an air inlet foradmitting air into the firebox after coaling, of a damper pivoted onsaid door for controlling the entrance of air through said inlet, ahandle pivoted to the door and extending forwardly therefrom for openingsaid door, and operating connections between said damper and said handlefor opening the former from the latter and holding it open when saidhandle is operated to open said door.

The combination with the coaling door of a furnace, said door having amovable handle and also having an air inlet, of means on the door forcontrolling admission of air into the furnace through said inlet, acombined latch and operating member connected operatively with said aircontrolling means, and means on said handle for actuating said Copies ofthis patent may be obtained for five cents each, by addressing theing-additional air "for controlling said member to open said aircontrolling means when said handle is actuated to open the door and forcoaction with said member in holding said air controlling means in openposition.

3. The combination with the coaling door of a furnace, said door havin amovable handle and also having an air in ct, of means on the door forcontrolling admission of air into the furnace through said inlet, acombined latch and operating member connected operatively with said aircontrolling means, and a cam on said handle for actuatlng said member toopen said air controlling means when said handle is actuated to open thedoor, and for coaction with said member in holding said air controllingmeans in open position.

4:. The combination with a furnace coaling door having an air inlet foradmitting air immediately after coaling, of a damper pivoted to saiddoor for controlling the entrance of air through said inlet, avertically swinging handle member pivoted to the door below said damperfor opening said door, said handle member having a cam, a latch memberpivoted to the door above said handle member and having a shoulder, theraising of said handle member serving to cause said cam tocorrespondingly raise said latch member, and a link pivoted to saiddamper at one end and pivoted at its other end to one of said membersfor opening said damper when said handle member is actuated to open thedoor, said cam and said shoulder coacting in holding said link in raisedposition.

5. The combination with a furnace coaling door, of an air heater carriedthereby for continuously supplying hot air to the firebox, an inletthrough said door for supplyafter coaling, a damper inlet, a movablehandle for opening said door, and operating connections between saidhandle and said damper for opening the latter from the former andholding it open when said handle is actuated to open the door.

In testimony whereof I have hereunto set my hand.

LEONIDAS D. WEST.

Commissioner of Yatents,

Washington, D. G.

